协调距离低可观测诊断测量系统

Defense SpectrumOrganization Joint Spectrum CenterAnnapolis, Maryland 21402 Consulting Report Coordination Distances for Low ObservableDiagnostic Measurement Systems DSO-CR-13-114 9 October 2013 Prepared for: Air Force Life Cycle Management CenterLow Observable Supportability Office2690 Loop Road West, Building 556Wright-Patterson AFB, OH 45433-7148 Prime Contractor Exelis Inc.16701 Melford Blvd., Suite 200Bowie, MD 20715 Approved for public release; distribution unlimited. This page intentionally left blank. Record of Changes This page intentionally left blank. EXECUTIVE SUMMARY Historically, the Air Force (AF) has used visual inspections and point inspection tools toidentify and to test for surface defects on Low Observable (LO) aircraft. To improve LOmaintenance capabilities, the AF Life Cycle Management Center LO Supportability Office(LOSO) at Wright-Patterson Air Force Base (AFB), OH, has supported the development ofLO Diagnostic Measurement Systems (LODMS) for the evaluation and maintenance of theLO properties of the Air Force aircraft. LODMS are designed for short-range diagnosticimaging while operating over a wide frequency range between 100 MHz and 18 GHz. Thedata for the Radio Frequency (RF) images are acquired by moving the LODMS around thetarget aircraft, while triggering RF sweeps and recording reflected RF signal levels foranalysis. To obtain certifications of spectrum support and frequency authorizations for LODMS, theNational Telecommunications and Information Administration (NTIA) required anevaluation of the potential of the LODMS to interfere with incumbent spectrum usersoperating within the 50 MHz to 18.5 GHz frequency range. In response to this NTIArequirement, the AF LO Program Offices have performed various modeling and analysistasks, including hangar attenuation measurements, emission measurements, and siteanalyses at a multitude of AFBs and hangars. These site analyses included an evaluation ofelectromagnetic compatibility between LODMS and specified communications-electronicsequipment at fixed locations. The LOSO and the Air Force Spectrum Management Office intend to leverage theseprevious measurements and analyses to develop a standard national coordination procedureto be used in the frequency authorization process for LODMS. To support this effort, theLOSO requested that the Joint Spectrum Center (JSC) determine a set of coordinationtrigger distances between LODMS and selected incumbent systems operating in the50 MHz to 18.5 GHz frequency range. The JSC calculated the LO coordination trigger distances and developed a proposedcoordination procedure to be used in a national frequency authorization process forLODMS. This page intentionally left blank. Table of Contents 1.INTRODUCTION.......................................................................................................... 1-11.1BACKGROUND ............................................................................................................. 1-11.2OBJECTIVE .................................................................................................................... 1-11.3SPECTRUM COORDINATION PROCEDURE............................................................ 1-12.LODMS AND INCUMBENT SYSTEM TECHNICAL DATA ................................ 2-13.REFERENCES............................................................................................................... 3-14.ACRONYM LIST .......................................................................................................... 4-1 List of Tables Table 1-1.LODMS Maximum EIRPAVG..................................................................................1-2Table 1-2.LO Coordination Trigger Distances.........................................................................1-3Table 2-1.SCI-2k Emission Characteristics .............................................................................2-1Table 2-2.LODMS EIRP..........................................................................................................2-2Table 2-3.Incumbent System Receiver Data by Station Class.................................................2-3 This page intentionally left blank. 1.INTRODUCTION This publication provides a standardized procedure to obtain frequency authorizations tooperate Low Observable Diagnostic Measurement Systems (LODMS). 1.1BACKGROUND The Air Force Life Cycle Management Center Low Observable Supportability Office hassupported the development of LODMS to identify surface defects on Low Observable (LO)aircraft and to verify LO surface repairs. LODMS are designed for short- range diagnosticimaging operating over a wide frequency range between 100 MHz and 18 GHz. The datafor the Radio Frequency (RF) images are acquired by moving the LODMS around thetarget of interest while triggering RF data sweeps across the operating frequency range andrecording reflected RF signal levels for analysis. To obtain certification of